<h2>
    填空题</h2>
<ul class="chooseUl">
    <li>
        <h4>
            {{item.question}}
        </h4>
        <nz-input *ngIf="item.count>=1" [(ngModel)]="userExam.answer1" (ngModelChange)="customChange($event, 1)" style="display: block;width: 30%; margin-top: 10px;"></nz-input>
        <nz-input *ngIf="item.count>=2" [(ngModel)]="userExam.answer2" (ngModelChange)="customChange($event, 2)" style="display: block;width: 30%; margin-top: 10px;"></nz-input>
        <nz-input *ngIf="item.count>=3" [(ngModel)]="userExam.answer3" (ngModelChange)="customChange($event, 3)" style="display: block;width: 30%; margin-top: 10px;"></nz-input>
        <nz-input *ngIf="item.count>=4" [(ngModel)]="userExam.answer4" (ngModelChange)="customChange($event, 4)" style="display: block;width: 30%; margin-top: 10px;"></nz-input>
    </li>
</ul>